If ReadCompaction is switched off, then it is better to not even submit background compaction jobs.
Summary: If ReadCompaction is switched off, then it is better to not even submit background compaction jobs. I see about 3% increase in read-throughput on a pure memory database. Test Plan: run db_bench Reviewers: heyongqiang Reviewed By: heyongqiang Differential Revision: https://reviews.facebook.net/D5673
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